@Roxtin : When the photos, specially of a trip, are viewed after long time, date and time on photos help to remember the time when the photos were taken and any interesting moment around it. But at time of putting it as wallpaper or for other purpose, I would like to remove the date and time stamp.
@ nuke'em : I want to remove 'date and time' from photos which are put by the camera and are not part of the picture taken. Not exactly sure if it is called watermark or exif.